126results about "Synchronisation" patented technology

The invention provides a joint denoising method and system based on multi-source noise suppression and sparse representation, and belongs to the technical field of noise suppression in ultrasonic detection of power equipment, and the method comprises the steps: synchronously collecting an ultrasonic echo signal, a vibration signal and an electromagnetic signal of a composite insulator; decomposing the ultrasonic echo signal into a plurality of modal components and undecomposed signal margins; extracting a dominant frequency component in the vibration signal, and identifying a resonance noise feature overlapped with the frequency band of the ultrasonic signal; detecting a pulse interference event in the electromagnetic signal, marking occurrence time and a frequency range, and generating a pulse event feature; performing frequency band suppression and time domain threshold processing on the modal component according to the resonance noise characteristics and the pulse event characteristics; performing sparse representation coding on the processed modal components, executing multiple rounds of iterative screening and orthogonalization processing, and screening an atom set matched with defect echoes; and reconstructing the de-noised ultrasonic signal by using the screened atom set, and combining the de-noised ultrasonic signal with the undecomposed signal margin to output a final result.

The invention provides a dynamic high-precision PTP (Precision Time Protocol) time synchronization system realized based on an FPGA (Field Programmable Gate Array), which comprises a master device and a slave device, and the master device and the slave device are connected through a PHY (Physical Layer) to carry out PTP time synchronization; the master device and the slave device have the same structure and comprise an FPGA and a voltage-controlled crystal oscillator; in the master device, the FPGA obtains the frequency difference and the phase difference between the master device and an externally input reference source, further adjusts the frequency of a voltage-controlled crystal oscillator, corrects a local time mark, and sends a PTP message to the slave device; and in the slave equipment, the FPGA obtains the frequency difference and the phase difference between the slave equipment and the master equipment based on the received PTP message, so that the frequency of the voltage-controlled crystal oscillator is adjusted, and the local time scale is corrected. According to the invention, low-cost and high-precision PTP time synchronization is realized.

The invention discloses a cosmic ray muon-based time synchronization system and synchronization method, and relates to the field of digital information transmission. The system comprises a time detector and a track detector which are arranged corresponding to a standard clock, and a case matching module, a time difference calculation module, a time adjusting module, a time detector and a track detector which are arranged corresponding to a clock to be calibrated, the case matching module is used for matching the cosmic ray muons according to the track information of the cosmic ray muons detected by the two track detectors and determining whether the cosmic ray muons penetrating through the two time synchronization devices belong to the same muon case or not, and if the cosmic ray muons penetrating through the two time synchronization devices belong to the same muon case, the time difference calculation module is used for obtaining theoretical flight time according to the track information detected by the track detectors; actual flight time is obtained according to a time detector; the time deviation is calculated according to the actual flight time and the theoretical flight time, the time adjusting module calibrates the clock to be calibrated according to the time deviation, and the precision and reliability of time synchronization in complex environments such as underwater and underground environments are improved.

The invention relates to a local clock calibration method and a time synchronization signal channel expansion system, a timed device receives a PPS signal transmitted by a channel expansion device, and the method comprises the following steps: based on a received PPS output signal, measuring and determining a period deviation y of a local clock of the timed device relative to a standard time; dynamically generating a correction step z and a correction interval b based on the period deviation y according to an allowable error threshold value Q; and in the next time service period, taking the calibration time interval b as a period, and utilizing the calibration step z to carry out multiple times of incremental adjustment on a local calibratable time counter, so that the timing of the local calibratable time counter is close to the standard time. According to the invention, the problem of one-to-many signal distribution can be solved with low cost and high reliability, and a time service algorithm which is low in calculation overhead and easy to transplant and deploy on MCUs with various performance levels can be realized.

Provided are a time synchronization method, apparatus and time synchronization system of an intelligent driving system, relating to the technical fields of autonomous driving, electronic technology, and time synchronization. The method includes: obtaining (S210) a second-level universal time and a corresponding Pulse Per Second signal; based on a first local timestamp of a captured Pulse Per Second signal, a second local timestamp of an execution time instant of an interrupt service routine, and a first global timestamp, determining (S220) a second global timestamp corresponding to a predetermined edge of the Pulse Per Second signal; based on a global timestamp of a current time instant and the second global timestamp, obtaining (S230) a sub-second time of the current time instant; based on the second-level universal time and the sub-second time, obtaining (S240) an accurate time of the current time instant.

The invention relates to the resetting of a receiver timer of a receiver for correlating receiver time information with a time generated by a transmitter timer of a transmitter, wherein the receiver is designed to receive radio messages transmitted to it by the transmitter. During this resetting, a first message from the transmitter is received by the receiver, wherein the reception comprises a radio time period during which the receiver's radio is active. Information is determined from which the start time or end time of the radio time period can be determined. The receiver timer is then reset according to the determined information. The method is flexible and can be used in particular for so-called "sleepy devices" or receivers that are temporarily in a sleep state.

The embodiment of the invention provides a mobile mapping system and a time synchronization method, and is applied to the technical field of positioning and map construction. The system comprises a device to be synchronized, an industrial personal computer and a controller. The controller is used for determining a global time reference and determining a reference time point for acquiring a hardware trigger signal; the to-be-synchronized device is used for acquiring data according to the hardware trigger signal; and the industrial personal computer is used for associating the data acquisition time of the to-be-synchronized equipment with the global time reference according to the global time reference and a receiving time point for receiving the data sent by the to-be-synchronized equipment. The time service mode depends on a hardware trigger signal, and effective time service of data acquired by the multi-source sensor can still be realized in a scene with weak GNSS signals or without GNSS signals, so that the synchronization precision of data acquisition time of the multi-source sensor is improved.

Provided are a time synchronization method, a time synchronization system of an intelligent driving system, an electronic device and a storage medium, relating to the technical fields of autonomous driving, electronic technology, and time synchronization. The method includes: obtaining a second-level universal time and a corresponding Pulse Per Second signal; based on a first local timestamp of a captured Pulse Per Second signal, a second local timestamp of an execution time instant of an interrupt service routine, and a first global timestamp, determining a second global timestamp corresponding to a predetermined edge of the Pulse Per Second signal; based on a global timestamp of a current time instant and the second global timestamp, obtaining a sub-second time of the current time instant; based on the second-level universal time and the sub-second time, obtaining an accurate time of the current time instant.

The invention discloses a high-precision self-timekeeping method based on an FPGA, and relates to the technical field of high-precision time synchronization, and the method comprises the steps: providing a 10MHz system clock through a constant-temperature active crystal oscillator, carrying out the up-sampling of the clock frequency to 200MHz through a phase-locked loop frequency multiplication algorithm, and carrying out the up-sampling of the clock frequency to 200MHz; performing time synchronization on the system by using reliable time data and effective pulse per second signals provided by a satellite module, screening and selecting reference pulse per second, recording reference pulse per second data of at least 30 minutes, monitoring a rising edge of the pulse per second based on a sampling rate of 200MHz, and storing a maximum value of a counter per second to an RAM (Random Access Memory); the high-precision self-timekeeping method based on the FPGA not only can cope with complex environmental conditions, but also can ensure that stable synchronization performance is kept under long-time operation, so that the strict requirement of a modern high-precision time synchronization system on clock precision is met.

Provided is a novel system for identifying the location of a terminal carried by a user or operated by the user.　This system includes at least one computer device. The system includes a location identification means for identifying the location of a terminal carried or operated by a user on the basis of the distance between each of a plurality of wireless devices and the terminal. The terminal may be a portable terminal carried by a first user. The system may include an evacuation-site identification means that identifies, on the basis of the identified location of the portable terminal, an evacuation site satisfying a prescribed condition.

The invention relates to a multi-time-source PTP time service circuit based on a Loongson SOC, and belongs to the technical field of timing systems. The time service circuit comprises a Loongson SOC, an FPGA, a high-stability crystal oscillator, an RS422 transceiver, a network card, a switch, computing blades 1-6 and an external clock source. According to the design scheme, the performance is stable and reliable, the mode is novel, the problem that interfaces between devices are incompatible in the equipment development process is solved, meanwhile, a design thought is provided for the time service scheme of the reinforced server, and a new solution is provided for transition of a new time service scheme and an old time service scheme. The scheme has been successfully applied to a certain reinforced server.

The invention discloses an intelligent diagnosis method and system for a distribution network hot-line work robot. The intelligent diagnosis method comprises the following steps that clock synchronization is conducted on all parts of the distribution network hot-line work robot; collecting multi-source data of the distribution network hot-line work robot under the synchronous clock, wherein the multi-source data comprises operation data of each part of the distribution network hot-line work robot; performing data fusion on the multi-source data based on a dynamic adaptive weighted fusion algorithm of the multi-source heterogeneous data to obtain fused data; and constructing a three-level diagnosis model to carry out fault diagnosis on the fused data to obtain the fault type of the distribution network hot-line work robot component. According to the method, the multi-source data of the distribution network hot-line work robot are fused, and the multiple diagnosis models are constructed for fault diagnosis, so that accurate diagnosis and early warning of component faults of the distribution network hot-line work robot are realized, the missed diagnosis rate is reduced, and the maintenance cost is reduced.

The invention provides an illumination synchronization method, system and device based on a GPS and a cloud end, and a storage medium. The method comprises the following steps: establishing local synchronization time of each light master controller in each building; receiving a GPS signal and analyzing first UTC time information; communicating with a cloud time service server through a network to obtain second UTC time information; respectively performing signal quality evaluation on the first UTC time information and the second UTC time information; dynamically selecting or weighting and fusing the first UTC time information and the second UTC time information based on the evaluation result to generate a reference time; and taming and calibrating the local clock source by using the reference time, and outputting the updated local synchronization time. According to the invention, through double time service source guarantee, extremely low time service errors among the main controllers can be maintained, accurate synchronous playing and timing control of cross-building light show are realized, and the reliability, stability and picture consistency of a large-scale light show system are effectively improved.

The invention provides a real-time synchronization and noise suppression method and system for a photoetching sensor array, and the method comprises the steps: capturing scattered light intensity fluctuation during photoetching exposure to generate a time sequence calibration pulse, and calculating a time sequence offset by combining the pulse with an original data packet of a sensor through an FPGA timestamp synchronization engine; adjusting a trigger signal through a digital delay line to realize time sequence calibration; inputting the calibrated data into a self-adaptive wavelet threshold filter, generating a dynamic threshold based on the speed and vibration intensity of the workpiece table, and outputting purified data through wavelet decomposition, specific layer detail coefficient soft threshold processing and reconstruction; and finally, feeding back the noise residual error of the purified data to the FPGA, and triggering secondary calibration when the noise residual error exceeds a threshold value. Through deep cooperation of the hardware-level timestamp engine and the physical constraint filter, the problems of time sequence offset and noise interference of the sensor array are thoroughly solved.

This invention relates to the field of unmanned aerial vehicle (UAV) control technology, and in particular to an injector time calibration method, apparatus, device, and medium. The method is applied to the MCU of the injector and includes: detecting the presence of a PPS IN signal and obtaining a detection result; determining the timing status based on the detection result; obtaining an error coefficient, which is the first time difference amplified by the device every second; calculating the total error time to be compensated based on the error coefficient and the timing status; and executing a compensation mechanism based on the total error time, thereby improving the synchronization accuracy and timekeeping accuracy.

The invention discloses a full-wave-band dynamic sunlight player with a three-stage coaxial soft light structure, and relates to the technical field of healthy lighting and high-precision simulation light sources. The core three-stage coaxial soft light structure is composed of a high-atomization concave soft light cavity, a convex high-reflection soft light structure and a full-coating high-transmittance soft light shell which are coaxial, and glare-free and high-uniformity full-wave-band light emitting is achieved. The equipment is provided with a full-wave band narrow-band combined lamp group covering weak ultraviolet rays to near infrared rays, so that a continuous sunlight spectrum is formed; single-band single-line independent driving is adopted, a pure hardware simulation gradual change control unit is matched, and non-stroboscopic smooth gradual change and accurate regulation and control are achieved. The equipment is provided with a local time service module and a storage medium, and a networking module can be selected to be matched with a factory spectrum calibration method to guarantee output consistency. The system can truly restore the natural sunlight spectrum, adapts to the biological rhythm, is suitable for medical treatment, laboratories, space stations and other scenes, and has the advantages of being high in reliability, continuous in spectrum, strong in soft light effect, high in biological friendliness and the like.

In various examples, sets of correlated timestamps are sampled from clock sources. The sets of correlated timestamps are used to compute translation data, such as offsets and / or rates of change of the clock sources. The offsets and / or rates of change may be used to translate a timestamp to a reference time domain. The sampled clock sources may be frequency locked and the translation may be performed without using the rates of change. For example, a running average of the offsets may be used to perform the translation. The translated timestamps and corresponding sensor measurements may be provided to one or more applications for use in performing one or more operations for a machine, such as perception and / or control operations.

Optical frequency reference apparatus (10) comprising - an atomic vapor cell (1), containing a vapor of reference atoms, said atomic vapor cell (1) comprising a first end (41) having a first window (4) and a second end (61), - a laser source (11) for generating a laser probe beam (3) adapted to excite a two-photon optical transition of said reference atoms, - an optical detector (14), adapted to detect a fluorescence signal emitted by said reference atoms, and - at least one reflective element (5, 15) wherein the laser source (11), the atomic vapor cell (1) and the at least one reflective element (5, 15) are configured such that, in operation, the probe beam (3) enters the atomic vapor cell (1) through said first window (4) at said first end (41) and crosses said vapor of reference atoms until said second end (61) through a defined optical path in a first forward direction (3a), the probe beam (3) is reflected backwards by said at least one reflective element (5, 15) and crosses said vapor of reference atoms a second time through the same defined optical path, in a second direction (3b) opposite to the first forward direction (3a), characterized in that the optical frequency reference apparatus (10) further comprises means (7, 9) for absorbing the reflected laser probe beam (3) exiting from the atomic vapor cell (1) according to the second direction (3b).

The invention discloses a method and device for a system to automatically calibrate a court electric energy meter clock, a system terminal and a metering box, and relates to the technical field of clock calibration, and the method comprises the steps: querying a time synchronization information group recorded by an electric energy meter of a court; calculating a clock error of the electric energy meter at each temperature point according to the time synchronization information group; and carrying out clock calibration on the electric energy meter based on the clock error. Through system time acquisition and logic of calculating a target clock error according to the temperature, real clock skew at different temperatures can be accurately matched, the problems of excessive calibration at a low temperature and insufficient calibration at a high temperature are avoided, the accuracy of an electric energy meter clock can be effectively improved, and error accumulation caused by temperature change is reduced. And through systematic data processing and analysis, the calibration process is further optimized, and the overall efficiency is improved.

The invention provides an integrated multi-sensing fusion system for monitoring the state of a rotating mechanical part, which comprises a multi-source sensing module, a signal processing module and a fusion analysis module, and is characterized in that the multi-source sensing module comprises a plurality of sensing units and is used for collecting multi-dimensional data in the operation process of rotating mechanical equipment; the signal processing module is used for performing preprocessing and analog-to-digital conversion on analog signals acquired by each sensing unit in the multi-source sensing module, the signal processing module comprises a main control unit, and the fusion analysis module comprises a fusion algorithm. The main control unit performs comprehensive analysis and information fusion on data output by each sensing unit through the fusion algorithm, and realizes real-time transmission of a processing result through a communication interface; by integrating a plurality of sensing units, a signal processing module and a fusion algorithm into a whole, deep fusion of hardware and software is realized, and the real-time performance and accuracy of state monitoring of the rotating mechanical part are ensured.

The invention relates to a satellite system timing function test system and method based on a 1553B bus, a test device comprises an on-satellite part and a ground part, and the on-satellite part comprises a telemetering and remote control unit, a central management unit, a GNSS and a plurality of remote terminals; the ground part comprises a 1553B bus monitor, ground telemetering and remote control equipment and integrated testing equipment; the integrated test equipment edits a test case; comprising GNSS time function test cases (GNSS pulse per second output function test and GNSS time output function check), center management unit satellite time maintenance function check cases (center management unit ground timing function test, GNSS timing function test and synchronous pulse timing function test) and remote terminal satellite time maintenance function test cases (remote terminal satellite time maintenance function test cases). A synchronous pulse signal timing function is used for testing, and a second pulse timing function is used for testing. The problem that the current satellite time test cannot meet the test requirement is solved, and the correctness of the full-chain timing function from the BC end to the RT end is verified.

Disclosed is a quartz oscillator system comprising: a quartz oscillator comprising a quartz crystal and an oscillator circuit whose frequency is based on a resonant frequency of the quartz crystal; a monitoring module for monitoring an output frequency of the quartz oscillator; a control system external to the quartz oscillator, and configured to compare the output frequency with a setpoint frequency, and apply an adjustment signal to an electronic circuit of the quartz oscillator to adjust a frequency of the quartz oscillator based on the comparison with the reference frequency.

The application discloses a time synchronization method and system fusing power line carrier technology, comprising: calculating the required number of time synchronization terminal clock sources of a to-be-time-synchronized terminal according to the environment topology change condition corresponding to the to-be-time-synchronized terminal at the current time, the power line carrier channel state and the first historical local time keeping condition; wherein the first historical local time keeping condition is used for updating the second historical local time keeping condition at the next time; selecting the same number of time synchronization terminal clock sources of the to-be-time-synchronized terminal from the to-be-time-synchronized terminal corresponding to the time synchronization terminal clock sources to synchronize time with the terminal clock sources of the same level of the to-be-time-synchronized terminal; the number of time synchronization terminal clock sources can be dynamically optimized, and the power line carrier time synchronization robustness is improved.

The invention relates to a time keeping and service system based on an FPGA, and belongs to the field of time synchronization. The system comprises an IRIGB signal source, a timing system board and a main board, firstly, an IRIGB signal source is connected to a timing system board, under the condition that an IRIGB signal is effective, the timing system board analyzes the signal, the timing system board communicates with a main board by generating whole-second interruption, and the main board controls whether the timing system board sends an interruption signal or not by controlling interruption enabling and obtains state information of the timing system board; after the main board receives an interrupt signal of the timing system board, the main board accesses the timing system board through the PCI-E bus so as to obtain time information; and under the condition that no IRIGB source exists outside, the mainboard carries out time service on the timing system board, and the timing system board maintains the written time. The IRIGB signal time keeping and service system based on the FPGA has the advantages of being high in precision, good in real-time performance, high in anti-interference capacity, easy to integrate and maintain and the like.

The invention provides an audio output sampling rate calculation method and device, electronic equipment and a storage medium. The method is applied to an audio playing system, and comprises the following steps: in an audio data playing process of an audio buffer area, detecting a filling level of the audio buffer area according to a preset detection frequency; wherein the filling level is used for indicating the current data volume of the audio buffer area; based on the filling level, first clock skew corresponding to the recent multiple detection periods is obtained, and a clock skew set is obtained; calculating a first clock calibration amount according to a first clock skew corresponding to the current detection period in the clock skew set; performing clock drift trend prediction on the clock skew set, and determining a second clock calibration amount according to a prediction result; and according to the first clock calibration amount and the second clock calibration amount, determining the sampling rate of at least one frame of audio data output audio buffer in the future. The method and the device are used for carrying out real-time, accurate and self-adaptive clock calibration on audio playing.

A system (30) for controlling, regulating or authenticating a timer comprises means (31) for measuring the frequency signal and / or rate of one or more timers based on a time reference provided by an optical atomic clock (10) comprising an atomic vapor chamber (1), the atomic vapor chamber (1) comprises a hermetically sealed enclosure (8) defining a volume containing a vapor of a reference atom (2), the hermetically sealed enclosure (8) comprising an optical inlet (3) allowing transmission of a probe beam adapted to excite an optical transition of the reference atom (2) and an optical outlet (4) allowing transmission of a fluorescence signal from the reference atom (2), the hermetically sealed housing (8) further comprises a wall (5) through which the fluorescent signal can penetrate, said wall (5) being coated on its outer side with a coating (6) which is reflective to the fluorescent signal.

An unmanned container truck automatic driving system time synchronization system, comprising: an automatic driving domain controller, a camera, an inertial navigation system and a laser radar, wherein: the camera is connected with the automatic driving domain controller through a MIPI interface; the inertial navigation system is connected with the automatic driving domain controller through an RS232 serial port line; the laser radar is connected with the automatic driving domain controller through an RS232 serial port line; PPS is distributed to the main SOC and the auxiliary SOC through the internal CPLD distribution of the controller, GPRMC signals are sent to multiple laser radars through multiple RS232 chip distributions, and GPRMC is sent to the main SOC and the auxiliary SOC through UDP, so that the time synchronization of the automatic driving domain controller and the multiple laser radars is solved, through double clock source setting, in the case of GPS time service exception, the internal clock source is adopted and is synchronized through NTP service, in the case of normal GPS time service, GPS time service is adopted, and the problem of system time exception in the case of GPS exception is solved.

Aspects herein describe techniques for synchronizing clocks between two moving platforms using optical signals generated from lasers to measure clock offsets and determine a separation distance between moving platforms. Once the clocks are synchronized (e.g., an offset between the clocks is determined), the moving platforms can share sensor data, location data, and other information which is dependent on accurate timestamps and relative positions. In one aspect, one of the platforms serves as a virtual mirror. That is, the platform transmits a pulse at the same instance a pulse is received, similar to a mirror that reflects incident light. For example, the first platform may transmit pulses which are received at the second platform. The second platform can use optical or electrical components to form the virtual mirror that transmits an optical pulse to the first platform each time a pulse is received at the second platform.

Provided are a wireless timepiece system and a method executed by the wireless timepiece system that can reduce the labor required for registration between a wireless terminal and a wireless timepiece. The wireless timepiece includes: a generation unit that generates a first signal including device address registration request identification information requesting registration of a device address; and a communication control unit that transmits the first signal generated by the generation unit, and the terminal device is provided with a registration unit that registers the device address on the basis of the device address registration request identification information included in the first signal transmitted by the wireless timepiece when the device address is not registered.

A method for estimating an operating parameter of a remote reference oscillator on a remote platform relative to a local reference oscillator on a local platform, both platforms moving independently, may be used to estimate a slant-range velocity, relative frequency, or relative gravitational potential between the two platforms. The method includes generating local and remote reference frequencies on the local and remote platforms, respectively, and sending them to the other platform. A locally received frequency can be determined by the local platform and a remotely received frequency may be determined by the remote platform. These collection of the transmitted and received frequencies between the platforms are used to estimate the operating parameter.